Manitowoc Published 10-01-12, Control # 044-05 4-27
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
Disassemble Boom
Disassemble the boom and jib combination as instructed in
the Rigging Guides in this section.
The crane must be in the following configuration to
disassemble its own boom and jib:
• Crane rigged as shown in Figure 4-16.
• Radius limited to 26 ft (7.9 m).
• Capacity limited to 40,000 lb (18 144 kg).
Remove Counterweights
See Figure 4-16 for following procedure.
The crane rotating bed must be in-line with carriage while
removing upper counterweight (360° swing is permitted
while disassembling counterweights and removing carbody
counterweights).
1. Raise boom until mast is vertical.
NOTE: Select and confirm SETUP mode. Proceed with
remote control operation for steps 2 – 8.
The remote controller has sufficient cable to allow
operator to stand alongside rear of crane and
closely observe operation.
2. Unpin counterweight lifting pendants from storage
position on mast (View C). Same pins are used in step 4.
3. Raise boom butt until lifting pendants can be connected
to counterweight lifting links (View B).
4. Pin counterweight lifting pendants to links.
5. Lower boom butt until counterweight lifting links are fully
raised (View D) and rear pins (View F) are loose.
6. Remove rear pins between engine base and
counterweight tray (View F).
7. Lower counterweight until front hooks on counterweight
tray disengage fixed pins on engine base (View E).
NOTE: The rear end of the counterweight lowers first. The
rollers on the counterweight tray roll along the
engine frame and guide the counterweight down.
8. Slowly lower counterweight to the ground until handling
pendants are slack (View G).
9. Disconnect counterweight handling pendants from lugs
on counterweight tray (Views H and I).
10. Store pins in pendant holes.
NOTE: Select and confirm STANDARD mode and use
boom hoist control in cab for remaining steps. Store
remote control.
WARNING
Falling Load Hazard!
Prevent crane from tipping or structural damage to
components:
• Do not exceed 26 ft (7.9) radius.
• Do not lift more than 40,000 lb (18 144 kg).
WARNING
Tipping Crane Hazard!
To prevent crane from tipping, remove upper crane
counterweight before removing carbody counterweights.
DANGER
Falling Load Hazard!
Always stand to side of counterweight while handling it.
Do not stand between counterweight and rear of crane
while handling counterweight. Never go under
counterweight unless counterweight is securely pinned in
place.
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